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DERIVATIVE INSTRUMENTS - Summary of Purchase and Sale Contracts for TBA Derivatives (Details) - TBA derivatives - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Dec. 31, 2024
Derivative [Line Items] |  |
Notional | $ 6,902,000 | $ 3,117,000
Implied Cost Basis | 6,612,755 | 3,158,058
Implied Market Value | 6,635,383 | 3,136,154
Net Carrying Value | 22,628 | (21,904)
Purchase contracts |  |
Derivative [Line Items] |  |
Notional | 6,902,000 | 4,237,000
Implied Cost Basis | 6,612,755 | 4,239,001
Implied Market Value | 6,635,383 | 4,209,341
Net Carrying Value | $ 22,628 | (29,660)
Sale contracts |  |
Derivative [Line Items] |  |
Notional |  | (1,120,000)
Implied Cost Basis |  | (1,080,943)
Implied Market Value |  | (1,073,187)
Net Carrying Value |  | $ 7,756

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